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Pension and Other Postretirement Plans - Schedule Of Obligations And Funded Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 25, 2022
Dec. 26, 2021
Pension Benefits      
Change in the Projected Benefit Obligation (PBO):      
Projected benefit obligation at beginning of year $ 128.9 $ 173.3  
Service cost 0.0 0.0 $ 0.0
Interest cost 6.5 5.1 4.7
Actuarial loss (gain) 7.9 (41.1)  
Benefits paid (7.7) (8.4)  
Settlements/Curtailments gain 0.0 0.0  
Projected benefit obligation at end of year 135.6 128.9 173.3
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases) 135.6 128.9  
Change in Plan Assets      
Beginning balance 119.4 166.2  
Actual return on plan assets 11.3 (39.5)  
Employer contributions 8.1 1.1  
Benefits paid (7.7) (8.4)  
Ending balance 131.1 119.4 166.2
Funded status (Fair value of plan assets less PBO) (4.5) (9.5)  
Postretirement Benefits      
Change in the Projected Benefit Obligation (PBO):      
Projected benefit obligation at beginning of year 3.2 3.5  
Service cost 0.5 0.5 0.4
Interest cost 0.3 0.3 0.2
Actuarial loss (gain) 0.5 0.4  
Benefits paid (0.2) (0.9)  
Settlements/Curtailments gain (0.2) (0.6)  
Projected benefit obligation at end of year 4.1 3.2 3.5
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases) 2.9 2.3  
Change in Plan Assets      
Beginning balance 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 1.0 0.9  
Benefits paid (1.0) (0.9)  
Ending balance 0.0 0.0 $ 0.0
Funded status (Fair value of plan assets less PBO) $ (4.1) $ (3.2)